Gary Paffett proved the value of experience as he led the way on the second day of running during the special F1 young driver test at Jerez in southern Spain - but a number of the 'rookies' caught the eye once again.

On a day affected by a cold start and midday shower, long-time McLaren-Mercedes test driver Paffett focussed his efforts on vibration tests, aero calibration tests, a baseline run, a brief look at some suspension modifications and a 2010-style heavier fuel load simulation - looking at the impact on car balance and tyre degradation, the results of which the team revealed proved encouraging. The Bromley ace will return to the cockpit on the third and final day, as will World series by Renault front-runner and former McLaren/Autosport BRDC Young Driver of the Year Oliver Turvey.

F1 2010 debutant and reigning runaway GP2 Series Champion Nico H?lkenberg lapped second-fastest for Williams - albeit the best part of half a second adrift of Paffett's marker, with British F3 Champion Daniel Ricciardo an impressive third for Red Bull Racing, who continued to get to grips with the Renault-powered RB5 whilst conducting tyre comparisons, aero and brake testing and heavy fuel load runs ahead of next season's refuelling ban. The Australian will remain in the car on Thursday.

"I found it a bit easier today," he reported. "I knew what to expect this morning and the procedures were easier to understand, so I was able to concentrate on improving my driving and hopefully giving my best in terms of providing the engineers with good feedback."

Next up was DTM race-winner Paul di Resta in the first of the two Force India VJM02s, covering 58 laps during the course of his morning stint. After completing installation runs and some initial set up work, the 23-year-old Scot went on to run a range of 2010 development items and conduct some fuel system evaluation, lapping second-fastest of the pre-lunch brigade.

"Yesterday the programme was to get comfortable in the car and to see how everything worked," affirmed the West Lothian ace. "I was able to get to a reasonable level quite quickly after one run, so I felt prepared and had progressed enough for the team to be able to use me to test some development items, which will of course help them in 2010.

"We had quite a structured programme this morning of running back-to-back set-up for 2009 and 2010 and both long and short runs, but it went pretty well. I'm up-to-speed now and I understand what I can do to improve my own performance. Equally, [on] each run we are doing something different so I need to keep learning and giving feedback so the team can get the information they need too. I hope they feel they can use me now."

Reigning Indy Lights Champion J.R. Hildebrand took over in the afternoon, and the Californian ran through a similar programme to di Resta, winding up just over a second slower in eighth as the cooler conditions and rain counted against him.

"When we first started running we were testing different brake settings, which really didn't work very well for me," the 21-year-old confessed. "The first couple of runs were really spent working on that and then getting to grips with the track again, particularly as the grip had improved. Coming into this test I was concerned I wouldn't be able to maximise the high-speed cornering of the car, but I was able to get the most out of the two high-speed sections of the track so I was really happy with this progress.

"On the run I got the best time we were running on a particularly conservative engine setting, so I was pretty satisfied, even if the lap time didn't really show on the timesheets. In terms of my comfort and confidence, however, both were way up today and I am actually really happy with how it went."

"We completed more than 100 laps between Paul and J.R. today to build on yesterday's positive start," concluded the Silverstone-based squad's chief race engineer Dominic Harlow. "We concentrated on looking more at the effects of 2010 regulation changes during today's test, and that has produced some interesting results for us. A good effort from the team and the drivers today in executing the programme, and we look forward to continuing the test tomorrow."

Esteban Gutierrez wound up in fifth place at the close of play, after replicating the programme of Alexander Rossi at BMW-Sauber from day one - a familiarisation with both track and car, followed by the evaluation of mechanical set-up changes after lunch. The young Mexican clearly impressed the team's engineers both with his feedback and the way he managed a heavy fuel load, though a hydraulic leak curtailed his running an hour ahead of schedule.

"It was a very positive day for me," enthused the 18-year-old afterwards. "The main idea was to live that experience, to enjoy the day and to learn. This very high professional level means you have to be very calm and use your intelligence. Due to the hydraulic problem in the afternoon I was unable to make use of two more sets of fresh tyres, but on the other hand I had five sets, which of course is more than I had ever had before in one day!

"I really thank the team for this much appreciated opportunity. I learned a lot for the day when I can hopefully jump into a Formula 1 car again. In the end, with the grip level getting higher, my neck was a bit stiff and it was good to evaluate my own physical condition - the extra training I did paid off."

Recently-crowned 2009 World Series by Renault Champion Bertrand Baguette will take over at the wheel on day three, having spent the opening day testing for Renault as a prize for his title success.

Mike Conway and Marcus Ericsson were evenly-matched in sixth and seventh for double 2009 F1 World Champions Brawn GP/Mercedes Grand Prix, separated by two tenths of a second - though with the Briton covering more than twice the number of laps as the Swede as the pair worked respectively on set-up changes and familiarisation with the BGP 001.

Behind Hildebrand in eighth, Jules Bianchi - who has inked a five-year deal with Ferrari - was ninth-quickest for the Scuderia, taking his total mileage for his two days in the scarlet machine to more than 900 kilometres. After running in race configuration all day, the Frenchman completed 113 laps before he hands over to the leading three competitors in the 2009 Italian F3 Championship - Daniel Zampieri, Marco Zipoli and Pablo S?nchez L?pez - for the last day.

"I know I wasn't particularly quick," reflected 20-year-old Bianchi, "but running in race configuration meant I was able to learn a lot. With the help of the team, I got to understand the car - especially its handling when running consistent lap times, which seemed really positive to me."

Renault reserve driver Lucas di Grassi and Superleague Formula race-winner Ho-Pin Tung wrapped up tenth and eleventh on the timing screens for the French manufacturer, with the former covering 54 laps in the afternoon after the latter had similarly enjoyed his first taste of the R29 with 67 laps of running during the morning.

"It was a productive day and good for me to get back in a current F1 car for the first time in almost a year," remarked di Grassi, the faster of the pair by six tenths of a second. "It felt quite different to drive this car with slicks, but I quickly got used to it and the systems on the car. Our programme was focussed on looking ahead to 2010, so we were running with high fuel loads and doing quite long runs. The track conditions were not too bad, but I think it will be even better tomorrow so we should be able to complete some more important work."

"This was my first proper test in an F1 car," added Tung, "and it was a great experience. To begin with I concentrated on finding a reasonable set-up, and then got down to working through the programme with the engineers as we tested some parts for the 2010 car. The morning went by so quickly, but it was good to cover 67 laps and the track really improved throughout.

"What impressed me most was the speed you can carry through the corners and the braking performance of these cars, which takes some getting used to. I learned a lot today and really enjoyed working with the whole team. I will stay here tomorrow so that I can sit in on all the debriefs and continue learning."

"We ran Ho-Pin for the first half of the day, starting off on scrubbed tyres before giving him a couple of new sets later in the morning," summarised the Enstone-based concern's chief race engineer Alan Permane. "I was impressed with Ho-Pin, as he settled into the car very quickly and worked well with the team. His driving style is quite well-suited to an F1 car as he used the tyres well, had a good feel for the car and gave us precise feedback.

"The afternoon was mainly about getting Lucas comfortable in the car ahead of his full day tomorrow, as this was his first time in the R29. Overall, we managed to complete our objectives for the day and we're well-prepared for another productive day tomorrow."

Bringing up the rear of the order finally - as on the first day - was Red Bull 'junior' operation Scuderia Toro Rosso, this time with FIA Formula Two Championship front-runner Mirko Bortolotti in the cockpit of the Ferrari-powered STR4. On his second outing in an F1 car - after previously piloting a Ferrari at Fiorano, as a reward for his Italian F3 title success in 2008 - the Red Bull Junior Driver programme member found himself forced to contend with mechanical issues early on, before remaining on-track almost continuously in the afternoon as he worked through aero and brake evaluation and heavy fuel runs.

"I really enjoyed today," enthused the 19-year-old Trento native, who will share driving duties with Brendon Hartley on Thursday. "Being able to help the team with testing for next year was very interesting, even though I had to spend some time in the garage in the morning. With so little testing allowed in Formula 1, today was very important for me, giving me the chance to do some miles."

To see the day two testing times, click here